Master thesis Defense by Maria Emilie Danø Hoffmann – University of Copenhagen

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Master thesis Defense by Maria Emilie Danø Hoffmann

Title: Development and charaterization of Micromegas detectors for the upgrade of the ATLAS muon spectrometer

Abstract: The scheduled upgrades of the Large Hadron Collider complex at CERN will increase the instantaneous luminosity to 5 x 1034 cm-2 s-1. As a result, the radiation levels in parts of the ATLAS Muon Spectrometer will reach levels that are beyond the limit of safe operation of the present detector technologies. To accommodate to the post-upgrade operating conditions, the Muon Spectrometer will undergo a complete replacement of its innermost end-cap stations in 2018. The MicroMegas detector technology has been chosen as a part of the new instrumentation because of its excellent performance under high irradiation rates. Experience with this relatively new technology is rather limited, and a set of milestones therefore had to be fulfilled before the technology could be accepted by the ATLAS Collaboration. We describe an extract of the work that led to the fulfillment of these milestones. We demonstrate that adequate single-plane spatial resolution close to 100 μm can be achieved by combining the μTPC technique with the traditional charge centroid method for tracks with an inclination in the range 10 40. We afterwards describe the R&D efforts that led to the successful construction of the first operational 1 x 1.2 m2 and 1 x 2.4 m2 MicroMegas prototypes.